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Maintain a back-pointer to the fsp in struct smb_Dir when opening with FDOPENDIR.
[Samba.git] / source3 / libsmb / clikrb5.c
blobdce1df7c9c221ff6d68041e3bbcce4c0e5b6a2a8
1 /*
2 Unix SMB/CIFS implementation.
3 simple kerberos5 routines for active directory
4 Copyright (C) Andrew Tridgell 2001
5 Copyright (C) Luke Howard 2002-2003
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
7 Copyright (C) Guenther Deschner 2005-2009
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23 #include "includes.h"
24 #include "smb_krb5.h"
25 #include "../librpc/gen_ndr/krb5pac.h"
26 #include "../lib/util/asn1.h"
27 #include "libsmb/nmblib.h"
28
29 #ifndef KRB5_AUTHDATA_WIN2K_PAC
30 #define KRB5_AUTHDATA_WIN2K_PAC 128
31 #endif
32
33 #ifndef KRB5_AUTHDATA_IF_RELEVANT
34 #define KRB5_AUTHDATA_IF_RELEVANT 1
35 #endif
36
37 #ifdef HAVE_KRB5
38
39 #define GSSAPI_CHECKSUM 0x8003 /* Checksum type value for Kerberos */
40 #define GSSAPI_BNDLENGTH 16 /* Bind Length (rfc-1964 pg.3) */
41 #define GSSAPI_CHECKSUM_SIZE (4+GSSAPI_BNDLENGTH+4) /* Length of bind length,
42 bind field, flags field. */
43
44 /* MIT krb5 1.7beta3 (in Ubuntu Karmic) is missing the prototype,
45 but still has the symbol */
46 #if !HAVE_DECL_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE
47 krb5_error_code krb5_auth_con_set_req_cksumtype(
48 krb5_context context,
49 krb5_auth_context auth_context,
50 krb5_cksumtype cksumtype);
51 #endif
52
53 /**************************************************************
54 Wrappers around kerberos string functions that convert from
55 utf8 -> unix charset and vica versa.
56 **************************************************************/
57
58 /**************************************************************
59 krb5_parse_name that takes a UNIX charset.
60 **************************************************************/
61
62 krb5_error_code smb_krb5_parse_name(krb5_context context,
63 const char *name, /* in unix charset */
64 krb5_principal *principal)
65 {
66 krb5_error_code ret;
67 char *utf8_name;
68 size_t converted_size;
69
70 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
71 return ENOMEM;
72 }
73
74 ret = krb5_parse_name(context, utf8_name, principal);
75 TALLOC_FREE(utf8_name);
76 return ret;
77 }
78
79 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
80 /**************************************************************
81 krb5_parse_name_norealm that takes a UNIX charset.
82 **************************************************************/
83
84 static krb5_error_code smb_krb5_parse_name_norealm_conv(krb5_context context,
85 const char *name, /* in unix charset */
86 krb5_principal *principal)
87 {
88 krb5_error_code ret;
89 char *utf8_name;
90 size_t converted_size;
91
92 *principal = NULL;
93 if (!push_utf8_talloc(talloc_tos(), &utf8_name, name, &converted_size)) {
94 return ENOMEM;
95 }
96
97 ret = krb5_parse_name_norealm(context, utf8_name, principal);
98 TALLOC_FREE(utf8_name);
99 return ret;
100 }
101 #endif
102
103 /**************************************************************
104 krb5_parse_name that returns a UNIX charset name. Must
105 be freed with talloc_free() call.
106 **************************************************************/
107
108 krb5_error_code smb_krb5_unparse_name(TALLOC_CTX *mem_ctx,
109 krb5_context context,
110 krb5_const_principal principal,
111 char **unix_name)
112 {
113 krb5_error_code ret;
114 char *utf8_name;
115 size_t converted_size;
116
117 *unix_name = NULL;
118 ret = krb5_unparse_name(context, principal, &utf8_name);
119 if (ret) {
120 return ret;
121 }
122
123 if (!pull_utf8_talloc(mem_ctx, unix_name, utf8_name, &converted_size)) {
124 krb5_free_unparsed_name(context, utf8_name);
125 return ENOMEM;
126 }
127 krb5_free_unparsed_name(context, utf8_name);
128 return 0;
129 }
130
131 #ifndef HAVE_KRB5_SET_REAL_TIME
132 /*
133 * This function is not in the Heimdal mainline.
134 */
135 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
136 {
137 krb5_error_code ret;
138 int32_t sec, usec;
139
140 ret = krb5_us_timeofday(context, &sec, &usec);
141 if (ret)
142 return ret;
143
144 context->kdc_sec_offset = seconds - sec;
145 context->kdc_usec_offset = microseconds - usec;
146
147 return 0;
148 }
149 #endif
150
151 #if !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
152
153 #if defined(HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES)
154
155 /* With MIT kerberos, we should use krb5_set_default_tgs_enctypes in preference
156 * to krb5_set_default_tgs_ktypes. See
157 * http://lists.samba.org/archive/samba-technical/2006-July/048271.html
158 *
159 * If the MIT libraries are not exporting internal symbols, we will end up in
160 * this branch, which is correct. Otherwise we will continue to use the
161 * internal symbol
162 */
163 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
164 {
165 return krb5_set_default_tgs_enctypes(ctx, enc);
166 }
167
168 #elif defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES)
169
170 /* Heimdal */
171 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
172 {
173 return krb5_set_default_in_tkt_etypes(ctx, enc);
174 }
175
176 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_ENCTYPES */
177
178 #endif /* HAVE_KRB5_SET_DEFAULT_TGS_KTYPES */
179
180 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
181 /* HEIMDAL */
182 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
183 {
184 memset(pkaddr, '\0', sizeof(krb5_address));
185 #if defined(HAVE_IPV6) && defined(KRB5_ADDRESS_INET6)
186 if (paddr->ss_family == AF_INET6) {
187 pkaddr->addr_type = KRB5_ADDRESS_INET6;
188 pkaddr->address.length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
189 pkaddr->address.data = (char *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
190 return true;
191 }
192 #endif
193 if (paddr->ss_family == AF_INET) {
194 pkaddr->addr_type = KRB5_ADDRESS_INET;
195 pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
196 pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
197 return true;
198 }
199 return false;
200 }
201 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
202 /* MIT */
203 bool setup_kaddr( krb5_address *pkaddr, struct sockaddr_storage *paddr)
204 {
205 memset(pkaddr, '\0', sizeof(krb5_address));
206 #if defined(HAVE_IPV6) && defined(ADDRTYPE_INET6)
207 if (paddr->ss_family == AF_INET6) {
208 pkaddr->addrtype = ADDRTYPE_INET6;
209 pkaddr->length = sizeof(((struct sockaddr_in6 *)paddr)->sin6_addr);
210 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in6 *)paddr)->sin6_addr);
211 return true;
212 }
213 #endif
214 if (paddr->ss_family == AF_INET) {
215 pkaddr->addrtype = ADDRTYPE_INET;
216 pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
217 pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
218 return true;
219 }
220 return false;
221 }
222 #else
223 #error UNKNOWN_ADDRTYPE
224 #endif
225
226 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY) && defined(HAVE_KRB5_ENCRYPT_BLOCK)
227 static int create_kerberos_key_from_string_direct(krb5_context context,
228 krb5_principal host_princ,
229 krb5_data *password,
230 krb5_keyblock *key,
231 krb5_enctype enctype)
232 {
233 int ret = 0;
234 krb5_data salt;
235 krb5_encrypt_block eblock;
236
237 ret = krb5_principal2salt(context, host_princ, &salt);
238 if (ret) {
239 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
240 return ret;
241 }
242 krb5_use_enctype(context, &eblock, enctype);
243 ret = krb5_string_to_key(context, &eblock, key, password, &salt);
244 SAFE_FREE(salt.data);
245
246 return ret;
247 }
248 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
249 static int create_kerberos_key_from_string_direct(krb5_context context,
250 krb5_principal host_princ,
251 krb5_data *password,
252 krb5_keyblock *key,
253 krb5_enctype enctype)
254 {
255 int ret;
256 krb5_salt salt;
257
258 ret = krb5_get_pw_salt(context, host_princ, &salt);
259 if (ret) {
260 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
261 return ret;
262 }
263
264 ret = krb5_string_to_key_salt(context, enctype, (const char *)password->data, salt, key);
265 krb5_free_salt(context, salt);
266
267 return ret;
268 }
269 #else
270 #error UNKNOWN_CREATE_KEY_FUNCTIONS
271 #endif
272
273 int create_kerberos_key_from_string(krb5_context context,
274 krb5_principal host_princ,
275 krb5_data *password,
276 krb5_keyblock *key,
277 krb5_enctype enctype,
278 bool no_salt)
279 {
280 krb5_principal salt_princ = NULL;
281 int ret;
282 /*
283 * Check if we've determined that the KDC is salting keys for this
284 * principal/enctype in a non-obvious way. If it is, try to match
285 * its behavior.
286 */
287 if (no_salt) {
288 KRB5_KEY_DATA(key) = (KRB5_KEY_DATA_CAST *)SMB_MALLOC(password->length);
289 if (!KRB5_KEY_DATA(key)) {
290 return ENOMEM;
291 }
292 memcpy(KRB5_KEY_DATA(key), password->data, password->length);
293 KRB5_KEY_LENGTH(key) = password->length;
294 KRB5_KEY_TYPE(key) = enctype;
295 return 0;
296 }
297 salt_princ = kerberos_fetch_salt_princ_for_host_princ(context, host_princ, enctype);
298 ret = create_kerberos_key_from_string_direct(context, salt_princ ? salt_princ : host_princ, password, key, enctype);
299 if (salt_princ) {
300 krb5_free_principal(context, salt_princ);
301 }
302 return ret;
303 }
304
305 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
306 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
307 krb5_enctype **enctypes)
308 {
309 return krb5_get_permitted_enctypes(context, enctypes);
310 }
311 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
312 krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
313 krb5_enctype **enctypes)
314 {
315 return krb5_get_default_in_tkt_etypes(context, enctypes);
316 }
317 #else
318 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
319 #endif
320
321 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
322 krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
323 krb5_auth_context auth_context,
324 krb5_keyblock *keyblock)
325 {
326 return krb5_auth_con_setkey(context, auth_context, keyblock);
327 }
328 #endif
329
330 bool unwrap_edata_ntstatus(TALLOC_CTX *mem_ctx,
331 DATA_BLOB *edata,
332 DATA_BLOB *edata_out)
333 {
334 DATA_BLOB edata_contents;
335 ASN1_DATA *data;
336 int edata_type;
337
338 if (!edata->length) {
339 return False;
340 }
341
342 data = asn1_init(mem_ctx);
343 if (data == NULL) {
344 return false;
345 }
346
347 asn1_load(data, *edata);
348 asn1_start_tag(data, ASN1_SEQUENCE(0));
349 asn1_start_tag(data, ASN1_CONTEXT(1));
350 asn1_read_Integer(data, &edata_type);
351
352 if (edata_type != KRB5_PADATA_PW_SALT) {
353 DEBUG(0,("edata is not of required type %d but of type %d\n",
354 KRB5_PADATA_PW_SALT, edata_type));
355 asn1_free(data);
356 return False;
357 }
358
359 asn1_start_tag(data, ASN1_CONTEXT(2));
360 asn1_read_OctetString(data, talloc_tos(), &edata_contents);
361 asn1_end_tag(data);
362 asn1_end_tag(data);
363 asn1_end_tag(data);
364 asn1_free(data);
365
366 *edata_out = data_blob_talloc(mem_ctx, edata_contents.data, edata_contents.length);
367
368 data_blob_free(&edata_contents);
369
370 return True;
371 }
372
373
374 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
375 {
376 DATA_BLOB pac_contents;
377 ASN1_DATA *data;
378 int data_type;
379
380 if (!auth_data->length) {
381 return False;
382 }
383
384 data = asn1_init(mem_ctx);
385 if (data == NULL) {
386 return false;
387 }
388
389 asn1_load(data, *auth_data);
390 asn1_start_tag(data, ASN1_SEQUENCE(0));
391 asn1_start_tag(data, ASN1_SEQUENCE(0));
392 asn1_start_tag(data, ASN1_CONTEXT(0));
393 asn1_read_Integer(data, &data_type);
394
395 if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
396 DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
397 asn1_free(data);
398 return False;
399 }
400
401 asn1_end_tag(data);
402 asn1_start_tag(data, ASN1_CONTEXT(1));
403 asn1_read_OctetString(data, talloc_tos(), &pac_contents);
404 asn1_end_tag(data);
405 asn1_end_tag(data);
406 asn1_end_tag(data);
407 asn1_free(data);
408
409 *unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
410
411 data_blob_free(&pac_contents);
412
413 return True;
414 }
415
416 bool get_auth_data_from_tkt(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, krb5_ticket *tkt)
417 {
418 DATA_BLOB auth_data_wrapped;
419 bool got_auth_data_pac = False;
420 int i;
421
422 #if defined(HAVE_KRB5_TKT_ENC_PART2)
423 if (tkt->enc_part2 && tkt->enc_part2->authorization_data &&
424 tkt->enc_part2->authorization_data[0] &&
425 tkt->enc_part2->authorization_data[0]->length)
426 {
427 for (i = 0; tkt->enc_part2->authorization_data[i] != NULL; i++) {
428
429 if (tkt->enc_part2->authorization_data[i]->ad_type !=
430 KRB5_AUTHDATA_IF_RELEVANT) {
431 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
432 tkt->enc_part2->authorization_data[i]->ad_type));
433 continue;
434 }
435
436 auth_data_wrapped = data_blob(tkt->enc_part2->authorization_data[i]->contents,
437 tkt->enc_part2->authorization_data[i]->length);
438
439 /* check if it is a PAC */
440 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
441 data_blob_free(&auth_data_wrapped);
442
443 if (got_auth_data_pac) {
444 return true;
445 }
446 }
447
448 return got_auth_data_pac;
449 }
450
451 #else
452 if (tkt->ticket.authorization_data &&
453 tkt->ticket.authorization_data->len)
454 {
455 for (i = 0; i < tkt->ticket.authorization_data->len; i++) {
456
457 if (tkt->ticket.authorization_data->val[i].ad_type !=
458 KRB5_AUTHDATA_IF_RELEVANT) {
459 DEBUG(10,("get_auth_data_from_tkt: ad_type is %d\n",
460 tkt->ticket.authorization_data->val[i].ad_type));
461 continue;
462 }
463
464 auth_data_wrapped = data_blob(tkt->ticket.authorization_data->val[i].ad_data.data,
465 tkt->ticket.authorization_data->val[i].ad_data.length);
466
467 /* check if it is a PAC */
468 got_auth_data_pac = unwrap_pac(mem_ctx, &auth_data_wrapped, auth_data);
469 data_blob_free(&auth_data_wrapped);
470
471 if (got_auth_data_pac) {
472 return true;
473 }
474 }
475
476 return got_auth_data_pac;
477 }
478 #endif
479 return False;
480 }
481
482 krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
483 {
484 #if defined(HAVE_KRB5_TKT_ENC_PART2)
485 return tkt->enc_part2->client;
486 #else
487 return tkt->client;
488 #endif
489 }
490
491 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
492 void krb5_free_unparsed_name(krb5_context context, char *val)
493 {
494 SAFE_FREE(val);
495 }
496 #endif
497
498 void kerberos_free_data_contents(krb5_context context, krb5_data *pdata)
499 {
500 #if defined(HAVE_KRB5_FREE_DATA_CONTENTS)
501 if (pdata->data) {
502 krb5_free_data_contents(context, pdata);
503 }
504 #else
505 SAFE_FREE(pdata->data);
506 #endif
507 }
508
509 void kerberos_set_creds_enctype(krb5_creds *pcreds, int enctype)
510 {
511 #if defined(HAVE_KRB5_KEYBLOCK_IN_CREDS)
512 KRB5_KEY_TYPE((&pcreds->keyblock)) = enctype;
513 #elif defined(HAVE_KRB5_SESSION_IN_CREDS)
514 KRB5_KEY_TYPE((&pcreds->session)) = enctype;
515 #else
516 #error UNKNOWN_KEYBLOCK_MEMBER_IN_KRB5_CREDS_STRUCT
517 #endif
518 }
519
520 bool kerberos_compatible_enctypes(krb5_context context,
521 krb5_enctype enctype1,
522 krb5_enctype enctype2)
523 {
524 #if defined(HAVE_KRB5_C_ENCTYPE_COMPARE)
525 krb5_boolean similar = 0;
526
527 krb5_c_enctype_compare(context, enctype1, enctype2, &similar);
528 return similar ? True : False;
529 #elif defined(HAVE_KRB5_ENCTYPES_COMPATIBLE_KEYS)
530 return krb5_enctypes_compatible_keys(context, enctype1, enctype2) ? True : False;
531 #endif
532 }
533
534 static bool ads_cleanup_expired_creds(krb5_context context,
535 krb5_ccache ccache,
536 krb5_creds *credsp)
537 {
538 krb5_error_code retval;
539 const char *cc_type = krb5_cc_get_type(context, ccache);
540
541 DEBUG(3, ("ads_cleanup_expired_creds: Ticket in ccache[%s:%s] expiration %s\n",
542 cc_type, krb5_cc_get_name(context, ccache),
543 http_timestring(talloc_tos(), credsp->times.endtime)));
544
545 /* we will probably need new tickets if the current ones
546 will expire within 10 seconds.
547 */
548 if (credsp->times.endtime >= (time(NULL) + 10))
549 return False;
550
551 /* heimdal won't remove creds from a file ccache, and
552 perhaps we shouldn't anyway, since internally we
553 use memory ccaches, and a FILE one probably means that
554 we're using creds obtained outside of our exectuable
555 */
556 if (strequal(cc_type, "FILE")) {
557 DEBUG(5, ("ads_cleanup_expired_creds: We do not remove creds from a %s ccache\n", cc_type));
558 return False;
559 }
560
561 retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
562 if (retval) {
563 DEBUG(1, ("ads_cleanup_expired_creds: krb5_cc_remove_cred failed, err %s\n",
564 error_message(retval)));
565 /* If we have an error in this, we want to display it,
566 but continue as though we deleted it */
567 }
568 return True;
569 }
570
571 /* Allocate and setup the auth context into the state we need. */
572
573 static krb5_error_code setup_auth_context(krb5_context context,
574 krb5_auth_context *auth_context)
575 {
576 krb5_error_code retval;
577
578 retval = krb5_auth_con_init(context, auth_context );
579 if (retval) {
580 DEBUG(1,("krb5_auth_con_init failed (%s)\n",
581 error_message(retval)));
582 return retval;
583 }
584
585 /* Ensure this is an addressless ticket. */
586 retval = krb5_auth_con_setaddrs(context, *auth_context, NULL, NULL);
587 if (retval) {
588 DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n",
589 error_message(retval)));
590 }
591
592 return retval;
593 }
594
595 static krb5_error_code create_gss_checksum(krb5_data *in_data, /* [inout] */
596 uint32_t gss_flags)
597 {
598 unsigned int orig_length = in_data->length;
599 unsigned int base_cksum_size = GSSAPI_CHECKSUM_SIZE;
600 char *gss_cksum = NULL;
601
602 if (orig_length) {
603 /* Extra length field for delgated ticket. */
604 base_cksum_size += 4;
605 }
606
607 if ((unsigned int)base_cksum_size + orig_length <
608 (unsigned int)base_cksum_size) {
609 return EINVAL;
610 }
611
612 gss_cksum = (char *)SMB_MALLOC(base_cksum_size + orig_length);
613 if (gss_cksum == NULL) {
614 return ENOMEM;
615 }
616
617 memset(gss_cksum, '\0', base_cksum_size + orig_length);
618 SIVAL(gss_cksum, 0, GSSAPI_BNDLENGTH);
619
620 /*
621 * GSS_C_NO_CHANNEL_BINDINGS means 16 zero bytes.
622 * This matches the behavior of heimdal and mit.
623 *
624 * And it is needed to work against some closed source
625 * SMB servers.
626 *
627 * See bug #7883
628 */
629 memset(&gss_cksum[4], 0x00, GSSAPI_BNDLENGTH);
630
631 SIVAL(gss_cksum, 20, gss_flags);
632
633 if (orig_length) {
634 SSVAL(gss_cksum, 24, 1); /* The Delegation Option identifier */
635 SSVAL(gss_cksum, 26, orig_length);
636 /* Copy the kerberos KRB_CRED data */
637 memcpy(gss_cksum + 28, in_data->data, orig_length);
638 free(in_data->data);
639 in_data->data = NULL;
640 in_data->length = 0;
641 }
642 in_data->data = gss_cksum;
643 in_data->length = base_cksum_size + orig_length;
644 return 0;
645 }
646
647 /*
648 we can't use krb5_mk_req because w2k wants the service to be in a particular format
649 */
650 static krb5_error_code ads_krb5_mk_req(krb5_context context,
651 krb5_auth_context *auth_context,
652 const krb5_flags ap_req_options,
653 const char *principal,
654 krb5_ccache ccache,
655 krb5_data *outbuf,
656 time_t *expire_time,
657 const char *impersonate_princ_s)
658 {
659 krb5_error_code retval;
660 krb5_principal server;
661 krb5_principal impersonate_princ = NULL;
662 krb5_creds * credsp;
663 krb5_creds creds;
664 krb5_data in_data;
665 bool creds_ready = False;
666 int i = 0, maxtries = 3;
667 uint32_t gss_flags = 0;
668
669 ZERO_STRUCT(in_data);
670
671 retval = smb_krb5_parse_name(context, principal, &server);
672 if (retval) {
673 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", principal));
674 return retval;
675 }
676
677 if (impersonate_princ_s) {
678 retval = smb_krb5_parse_name(context, impersonate_princ_s,
679 &impersonate_princ);
680 if (retval) {
681 DEBUG(1,("ads_krb5_mk_req: Failed to parse principal %s\n", impersonate_princ_s));
682 goto cleanup_princ;
683 }
684 }
685
686 /* obtain ticket & session key */
687 ZERO_STRUCT(creds);
688 if ((retval = krb5_copy_principal(context, server, &creds.server))) {
689 DEBUG(1,("ads_krb5_mk_req: krb5_copy_principal failed (%s)\n",
690 error_message(retval)));
691 goto cleanup_princ;
692 }
693
694 if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
695 /* This can commonly fail on smbd startup with no ticket in the cache.
696 * Report at higher level than 1. */
697 DEBUG(3,("ads_krb5_mk_req: krb5_cc_get_principal failed (%s)\n",
698 error_message(retval)));
699 goto cleanup_creds;
700 }
701
702 while (!creds_ready && (i < maxtries)) {
703
704 if ((retval = smb_krb5_get_credentials(context, ccache,
705 creds.client,
706 creds.server,
707 impersonate_princ,
708 &credsp))) {
709 DEBUG(1,("ads_krb5_mk_req: smb_krb5_get_credentials failed for %s (%s)\n",
710 principal, error_message(retval)));
711 goto cleanup_creds;
712 }
713
714 /* cope with ticket being in the future due to clock skew */
715 if ((unsigned)credsp->times.starttime > time(NULL)) {
716 time_t t = time(NULL);
717 int time_offset =(int)((unsigned)credsp->times.starttime-t);
718 DEBUG(4,("ads_krb5_mk_req: Advancing clock by %d seconds to cope with clock skew\n", time_offset));
719 krb5_set_real_time(context, t + time_offset + 1, 0);
720 }
721
722 if (!ads_cleanup_expired_creds(context, ccache, credsp)) {
723 creds_ready = True;
724 }
725
726 i++;
727 }
728
729 DEBUG(10,("ads_krb5_mk_req: Ticket (%s) in ccache (%s:%s) is valid until: (%s - %u)\n",
730 principal, krb5_cc_get_type(context, ccache), krb5_cc_get_name(context, ccache),
731 http_timestring(talloc_tos(), (unsigned)credsp->times.endtime),
732 (unsigned)credsp->times.endtime));
733
734 if (expire_time) {
735 *expire_time = (time_t)credsp->times.endtime;
736 }
737
738 /* Allocate the auth_context. */
739 retval = setup_auth_context(context, auth_context);
740 if (retval) {
741 DEBUG(1,("setup_auth_context failed (%s)\n",
742 error_message(retval)));
743 goto cleanup_creds;
744 }
745
746 #if defined(TKT_FLG_OK_AS_DELEGATE ) && defined(HAVE_KRB5_FWD_TGT_CREDS) && defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY) && defined(KRB5_AUTH_CONTEXT_USE_SUBKEY) && defined(HAVE_KRB5_AUTH_CON_SET_REQ_CKSUMTYPE)
747 if( credsp->ticket_flags & TKT_FLG_OK_AS_DELEGATE ) {
748 /* Fetch a forwarded TGT from the KDC so that we can hand off a 2nd ticket
749 as part of the kerberos exchange. */
750
751 DEBUG( 3, ("ads_krb5_mk_req: server marked as OK to delegate to, building forwardable TGT\n") );
752
753 retval = krb5_auth_con_setuseruserkey(context,
754 *auth_context,
755 &credsp->keyblock );
756 if (retval) {
757 DEBUG(1,("krb5_auth_con_setuseruserkey failed (%s)\n",
758 error_message(retval)));
759 goto cleanup_creds;
760 }
761
762 /* Must use a subkey for forwarded tickets. */
763 retval = krb5_auth_con_setflags(context,
764 *auth_context,
765 KRB5_AUTH_CONTEXT_USE_SUBKEY);
766 if (retval) {
767 DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
768 error_message(retval)));
769 goto cleanup_creds;
770 }
771
772 retval = krb5_fwd_tgt_creds(context,/* Krb5 context [in] */
773 *auth_context, /* Authentication context [in] */
774 CONST_DISCARD(char *, KRB5_TGS_NAME), /* Ticket service name ("krbtgt") [in] */
775 credsp->client, /* Client principal for the tgt [in] */
776 credsp->server, /* Server principal for the tgt [in] */
777 ccache, /* Credential cache to use for storage [in] */
778 1, /* Turn on for "Forwardable ticket" [in] */
779 &in_data ); /* Resulting response [out] */
780
781 if (retval) {
782 DEBUG( 3, ("krb5_fwd_tgt_creds failed (%s)\n",
783 error_message( retval ) ) );
784
785 /*
786 * This is not fatal. Delete the *auth_context and continue
787 * with krb5_mk_req_extended to get a non-forwardable ticket.
788 */
789
790 if (in_data.data) {
791 free( in_data.data );
792 in_data.data = NULL;
793 in_data.length = 0;
794 }
795 krb5_auth_con_free(context, *auth_context);
796 *auth_context = NULL;
797 retval = setup_auth_context(context, auth_context);
798 if (retval) {
799 DEBUG(1,("setup_auth_context failed (%s)\n",
800 error_message(retval)));
801 goto cleanup_creds;
802 }
803 } else {
804 /* We got a delegated ticket. */
805 gss_flags |= GSS_C_DELEG_FLAG;
806 }
807 }
808
809 /* Frees and reallocates in_data into a GSS checksum blob. */
810 retval = create_gss_checksum(&in_data, gss_flags);
811 if (retval) {
812 goto cleanup_data;
813 }
814
815 /* We always want GSS-checksum types. */
816 retval = krb5_auth_con_set_req_cksumtype(context, *auth_context, GSSAPI_CHECKSUM );
817 if (retval) {
818 DEBUG(1,("krb5_auth_con_set_req_cksumtype failed (%s)\n",
819 error_message(retval)));
820 goto cleanup_data;
821 }
822 #endif
823
824 retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
825 &in_data, credsp, outbuf);
826 if (retval) {
827 DEBUG(1,("ads_krb5_mk_req: krb5_mk_req_extended failed (%s)\n",
828 error_message(retval)));
829 }
830
831 cleanup_data:
832 if (in_data.data) {
833 free( in_data.data );
834 in_data.length = 0;
835 }
836
837 krb5_free_creds(context, credsp);
838
839 cleanup_creds:
840 krb5_free_cred_contents(context, &creds);
841
842 cleanup_princ:
843 krb5_free_principal(context, server);
844 if (impersonate_princ) {
845 krb5_free_principal(context, impersonate_princ);
846 }
847
848 return retval;
849 }
850
851 /*
852 get a kerberos5 ticket for the given service
853 */
854 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
855 const char *principal, time_t time_offset,
856 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
857 uint32_t extra_ap_opts, const char *ccname,
858 time_t *tgs_expire,
859 const char *impersonate_princ_s)
860
861 {
862 krb5_error_code retval;
863 krb5_data packet;
864 krb5_context context = NULL;
865 krb5_ccache ccdef = NULL;
866 krb5_auth_context auth_context = NULL;
867 krb5_enctype enc_types[] = {
868 #ifdef HAVE_ENCTYPE_AES256_CTS_HMAC_SHA1_96
869 ENCTYPE_AES256_CTS_HMAC_SHA1_96,
870 #endif
871 #ifdef HAVE_ENCTYPE_AES128_CTS_HMAC_SHA1_96
872 ENCTYPE_AES128_CTS_HMAC_SHA1_96,
873 #endif
874 ENCTYPE_ARCFOUR_HMAC,
875 ENCTYPE_DES_CBC_MD5,
876 ENCTYPE_DES_CBC_CRC,
877 ENCTYPE_NULL};
878
879 initialize_krb5_error_table();
880 retval = krb5_init_context(&context);
881 if (retval) {
882 DEBUG(1, ("krb5_init_context failed (%s)\n",
883 error_message(retval)));
884 goto failed;
885 }
886
887 if (time_offset != 0) {
888 krb5_set_real_time(context, time(NULL) + time_offset, 0);
889 }
890
891 if ((retval = krb5_cc_resolve(context, ccname ?
892 ccname : krb5_cc_default_name(context), &ccdef))) {
893 DEBUG(1, ("krb5_cc_default failed (%s)\n",
894 error_message(retval)));
895 goto failed;
896 }
897
898 if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
899 DEBUG(1, ("krb5_set_default_tgs_ktypes failed (%s)\n",
900 error_message(retval)));
901 goto failed;
902 }
903
904 retval = ads_krb5_mk_req(context, &auth_context,
905 AP_OPTS_USE_SUBKEY | (krb5_flags)extra_ap_opts,
906 principal, ccdef, &packet,
907 tgs_expire, impersonate_princ_s);
908 if (retval) {
909 goto failed;
910 }
911
912 get_krb5_smb_session_key(mem_ctx, context, auth_context,
913 session_key_krb5, false);
914
915 *ticket = data_blob_talloc(mem_ctx, packet.data, packet.length);
916
917 kerberos_free_data_contents(context, &packet);
918
919 failed:
920
921 if (context) {
922 if (ccdef)
923 krb5_cc_close(context, ccdef);
924 if (auth_context)
925 krb5_auth_con_free(context, auth_context);
926 krb5_free_context(context);
927 }
928
929 return retval;
930 }
931
932 bool get_krb5_smb_session_key(TALLOC_CTX *mem_ctx,
933 krb5_context context,
934 krb5_auth_context auth_context,
935 DATA_BLOB *session_key, bool remote)
936 {
937 krb5_keyblock *skey = NULL;
938 krb5_error_code err = 0;
939 bool ret = false;
940
941 if (remote) {
942 err = krb5_auth_con_getremotesubkey(context,
943 auth_context, &skey);
944 } else {
945 err = krb5_auth_con_getlocalsubkey(context,
946 auth_context, &skey);
947 }
948
949 if (err || skey == NULL) {
950 DEBUG(10, ("KRB5 error getting session key %d\n", err));
951 goto done;
952 }
953
954 DEBUG(10, ("Got KRB5 session key of length %d\n",
955 (int)KRB5_KEY_LENGTH(skey)));
956
957 *session_key = data_blob_talloc(mem_ctx,
958 KRB5_KEY_DATA(skey),
959 KRB5_KEY_LENGTH(skey));
960 dump_data_pw("KRB5 Session Key:\n",
961 session_key->data,
962 session_key->length);
963
964 ret = true;
965
966 done:
967 if (skey) {
968 krb5_free_keyblock(context, skey);
969 }
970
971 return ret;
972 }
973
974
975 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
976 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i );
977
978 const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
979 {
980 static krb5_data kdata;
981
982 kdata.data = (char *)krb5_principal_get_comp_string(context, principal, i);
983 kdata.length = strlen((const char *)kdata.data);
984 return &kdata;
985 }
986 #endif
987
988 krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
989 {
990 /* Try krb5_free_keytab_entry_contents first, since
991 * MIT Kerberos >= 1.7 has both krb5_free_keytab_entry_contents and
992 * krb5_kt_free_entry but only has a prototype for the first, while the
993 * second is considered private.
994 */
995 #if defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
996 return krb5_free_keytab_entry_contents(context, kt_entry);
997 #elif defined(HAVE_KRB5_KT_FREE_ENTRY)
998 return krb5_kt_free_entry(context, kt_entry);
999 #else
1000 #error UNKNOWN_KT_FREE_FUNCTION
1001 #endif
1002 }
1003
1004 void smb_krb5_checksum_from_pac_sig(krb5_checksum *cksum,
1005 struct PAC_SIGNATURE_DATA *sig)
1006 {
1007 #ifdef HAVE_CHECKSUM_IN_KRB5_CHECKSUM
1008 cksum->cksumtype = (krb5_cksumtype)sig->type;
1009 cksum->checksum.length = sig->signature.length;
1010 cksum->checksum.data = sig->signature.data;
1011 #else
1012 cksum->checksum_type = (krb5_cksumtype)sig->type;
1013 cksum->length = sig->signature.length;
1014 cksum->contents = sig->signature.data;
1015 #endif
1016 }
1017
1018 krb5_error_code smb_krb5_verify_checksum(krb5_context context,
1019 const krb5_keyblock *keyblock,
1020 krb5_keyusage usage,
1021 krb5_checksum *cksum,
1022 uint8 *data,
1023 size_t length)
1024 {
1025 krb5_error_code ret;
1026
1027 /* verify the checksum */
1028
1029 /* welcome to the wonderful world of samba's kerberos abstraction layer:
1030 *
1031 * function heimdal 0.6.1rc3 heimdal 0.7 MIT krb 1.4.2
1032 * -----------------------------------------------------------------------------
1033 * krb5_c_verify_checksum - works works
1034 * krb5_verify_checksum works (6 args) works (6 args) broken (7 args)
1035 */
1036
1037 #if defined(HAVE_KRB5_C_VERIFY_CHECKSUM)
1038 {
1039 krb5_boolean checksum_valid = False;
1040 krb5_data input;
1041
1042 input.data = (char *)data;
1043 input.length = length;
1044
1045 ret = krb5_c_verify_checksum(context,
1046 keyblock,
1047 usage,
1048 &input,
1049 cksum,
1050 &checksum_valid);
1051 if (ret) {
1052 DEBUG(3,("smb_krb5_verify_checksum: krb5_c_verify_checksum() failed: %s\n",
1053 error_message(ret)));
1054 return ret;
1055 }
1056
1057 if (!checksum_valid)
1058 ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
1059 }
1060
1061 #elif KRB5_VERIFY_CHECKSUM_ARGS == 6 && defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CRYPTO) && defined(HAVE_KRB5_CRYPTO_DESTROY)
1062
1063 /* Warning: MIT's krb5_verify_checksum cannot be used as it will use a key
1064 * without enctype and it ignores any key_usage types - Guenther */
1065
1066 {
1067
1068 krb5_crypto crypto;
1069 ret = krb5_crypto_init(context,
1070 keyblock,
1071 0,
1072 &crypto);
1073 if (ret) {
1074 DEBUG(0,("smb_krb5_verify_checksum: krb5_crypto_init() failed: %s\n",
1075 error_message(ret)));
1076 return ret;
1077 }
1078
1079 ret = krb5_verify_checksum(context,
1080 crypto,
1081 usage,
1082 data,
1083 length,
1084 cksum);
1085
1086 krb5_crypto_destroy(context, crypto);
1087 }
1088
1089 #else
1090 #error UNKNOWN_KRB5_VERIFY_CHECKSUM_FUNCTION
1091 #endif
1092
1093 return ret;
1094 }
1095
1096 time_t get_authtime_from_tkt(krb5_ticket *tkt)
1097 {
1098 #if defined(HAVE_KRB5_TKT_ENC_PART2)
1099 return tkt->enc_part2->times.authtime;
1100 #else
1101 return tkt->ticket.authtime;
1102 #endif
1103 }
1104
1105 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1106 static int get_kvno_from_ap_req(krb5_ap_req *ap_req)
1107 {
1108 #ifdef HAVE_TICKET_POINTER_IN_KRB5_AP_REQ /* MIT */
1109 if (ap_req->ticket->enc_part.kvno)
1110 return ap_req->ticket->enc_part.kvno;
1111 #else /* Heimdal */
1112 if (ap_req->ticket.enc_part.kvno)
1113 return *ap_req->ticket.enc_part.kvno;
1114 #endif
1115 return 0;
1116 }
1117
1118 static krb5_enctype get_enctype_from_ap_req(krb5_ap_req *ap_req)
1119 {
1120 #ifdef HAVE_ETYPE_IN_ENCRYPTEDDATA /* Heimdal */
1121 return ap_req->ticket.enc_part.etype;
1122 #else /* MIT */
1123 return ap_req->ticket->enc_part.enctype;
1124 #endif
1125 }
1126 #endif /* HAVE_KRB5_DECODE_AP_REQ */
1127
1128 static krb5_error_code
1129 get_key_from_keytab(krb5_context context,
1130 krb5_const_principal server,
1131 krb5_enctype enctype,
1132 krb5_kvno kvno,
1133 krb5_keyblock **out_key)
1134 {
1135 krb5_keytab_entry entry;
1136 krb5_error_code ret;
1137 krb5_keytab keytab;
1138 char *name = NULL;
1139 krb5_keyblock *keyp;
1140
1141 /* We have to open a new keytab handle here, as MIT does
1142 an implicit open/getnext/close on krb5_kt_get_entry. We
1143 may be in the middle of a keytab enumeration when this is
1144 called. JRA. */
1145
1146 ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
1147 if (ret) {
1148 DEBUG(1,("get_key_from_keytab: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
1149 return ret;
1150 }
1151
1152 if ( DEBUGLEVEL >= 10 ) {
1153 if (smb_krb5_unparse_name(talloc_tos(), context, server, &name) == 0) {
1154 DEBUG(10,("get_key_from_keytab: will look for kvno %d, enctype %d and name: %s\n",
1155 kvno, enctype, name));
1156 TALLOC_FREE(name);
1157 }
1158 }
1159
1160 ret = krb5_kt_get_entry(context,
1161 keytab,
1162 server,
1163 kvno,
1164 enctype,
1165 &entry);
1166
1167 if (ret) {
1168 DEBUG(0,("get_key_from_keytab: failed to retrieve key: %s\n", error_message(ret)));
1169 goto out;
1170 }
1171
1172 keyp = KRB5_KT_KEY(&entry);
1173
1174 ret = krb5_copy_keyblock(context, keyp, out_key);
1175 if (ret) {
1176 DEBUG(0,("get_key_from_keytab: failed to copy key: %s\n", error_message(ret)));
1177 goto out;
1178 }
1179
1180 smb_krb5_kt_free_entry(context, &entry);
1181
1182 out:
1183 krb5_kt_close(context, keytab);
1184 return ret;
1185 }
1186
1187 /* Prototypes */
1188
1189 krb5_error_code smb_krb5_get_keyinfo_from_ap_req(krb5_context context,
1190 const krb5_data *inbuf,
1191 krb5_kvno *kvno,
1192 krb5_enctype *enctype)
1193 {
1194 #ifdef HAVE_KRB5_DECODE_AP_REQ /* Heimdal */
1195 {
1196 krb5_error_code ret;
1197 krb5_ap_req ap_req;
1198
1199 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
1200 if (ret)
1201 return ret;
1202
1203 *kvno = get_kvno_from_ap_req(&ap_req);
1204 *enctype = get_enctype_from_ap_req(&ap_req);
1205
1206 free_AP_REQ(&ap_req);
1207 return 0;
1208 }
1209 #endif
1210
1211 /* Possibly not an appropriate error code. */
1212 return KRB5KDC_ERR_BADOPTION;
1213 }
1214
1215 krb5_error_code krb5_rd_req_return_keyblock_from_keytab(krb5_context context,
1216 krb5_auth_context *auth_context,
1217 const krb5_data *inbuf,
1218 krb5_const_principal server,
1219 krb5_keytab keytab,
1220 krb5_flags *ap_req_options,
1221 krb5_ticket **ticket,
1222 krb5_keyblock **keyblock)
1223 {
1224 krb5_error_code ret;
1225 krb5_kvno kvno;
1226 krb5_enctype enctype;
1227 krb5_keyblock *local_keyblock;
1228
1229 ret = krb5_rd_req(context,
1230 auth_context,
1231 inbuf,
1232 server,
1233 keytab,
1234 ap_req_options,
1235 ticket);
1236 if (ret) {
1237 return ret;
1238 }
1239
1240 #ifdef KRB5_TICKET_HAS_KEYINFO
1241 enctype = (*ticket)->enc_part.enctype;
1242 kvno = (*ticket)->enc_part.kvno;
1243 #else
1244 ret = smb_krb5_get_keyinfo_from_ap_req(context, inbuf, &kvno, &enctype);
1245 if (ret) {
1246 return ret;
1247 }
1248 #endif
1249
1250 ret = get_key_from_keytab(context,
1251 server,
1252 enctype,
1253 kvno,
1254 &local_keyblock);
1255 if (ret) {
1256 DEBUG(0,("krb5_rd_req_return_keyblock_from_keytab: failed to call get_key_from_keytab\n"));
1257 goto out;
1258 }
1259
1260 out:
1261 if (ret && local_keyblock != NULL) {
1262 krb5_free_keyblock(context, local_keyblock);
1263 } else {
1264 *keyblock = local_keyblock;
1265 }
1266
1267 return ret;
1268 }
1269
1270 krb5_error_code smb_krb5_parse_name_norealm(krb5_context context,
1271 const char *name,
1272 krb5_principal *principal)
1273 {
1274 #ifdef HAVE_KRB5_PARSE_NAME_NOREALM
1275 return smb_krb5_parse_name_norealm_conv(context, name, principal);
1276 #endif
1277
1278 /* we are cheating here because parse_name will in fact set the realm.
1279 * We don't care as the only caller of smb_krb5_parse_name_norealm
1280 * ignores the realm anyway when calling
1281 * smb_krb5_principal_compare_any_realm later - Guenther */
1282
1283 return smb_krb5_parse_name(context, name, principal);
1284 }
1285
1286 bool smb_krb5_principal_compare_any_realm(krb5_context context,
1287 krb5_const_principal princ1,
1288 krb5_const_principal princ2)
1289 {
1290 #ifdef HAVE_KRB5_PRINCIPAL_COMPARE_ANY_REALM
1291
1292 return krb5_principal_compare_any_realm(context, princ1, princ2);
1293
1294 /* krb5_princ_size is a macro in MIT */
1295 #elif defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)
1296
1297 int i, len1, len2;
1298 const krb5_data *p1, *p2;
1299
1300 len1 = krb5_princ_size(context, princ1);
1301 len2 = krb5_princ_size(context, princ2);
1302
1303 if (len1 != len2)
1304 return False;
1305
1306 for (i = 0; i < len1; i++) {
1307
1308 p1 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ1), i);
1309 p2 = krb5_princ_component(context, CONST_DISCARD(krb5_principal, princ2), i);
1310
1311 if (p1->length != p2->length || memcmp(p1->data, p2->data, p1->length))
1312 return False;
1313 }
1314
1315 return True;
1316 #else
1317 #error NO_SUITABLE_PRINCIPAL_COMPARE_FUNCTION
1318 #endif
1319 }
1320
1321 krb5_error_code smb_krb5_renew_ticket(const char *ccache_string, /* FILE:/tmp/krb5cc_0 */
1322 const char *client_string, /* gd@BER.SUSE.DE */
1323 const char *service_string, /* krbtgt/BER.SUSE.DE@BER.SUSE.DE */
1324 time_t *expire_time)
1325 {
1326 krb5_error_code ret;
1327 krb5_context context = NULL;
1328 krb5_ccache ccache = NULL;
1329 krb5_principal client = NULL;
1330 krb5_creds creds, creds_in, *creds_out = NULL;
1331
1332 ZERO_STRUCT(creds);
1333 ZERO_STRUCT(creds_in);
1334
1335 initialize_krb5_error_table();
1336 ret = krb5_init_context(&context);
1337 if (ret) {
1338 goto done;
1339 }
1340
1341 if (!ccache_string) {
1342 ccache_string = krb5_cc_default_name(context);
1343 }
1344
1345 if (!ccache_string) {
1346 ret = EINVAL;
1347 goto done;
1348 }
1349
1350 DEBUG(10,("smb_krb5_renew_ticket: using %s as ccache\n", ccache_string));
1351
1352 /* FIXME: we should not fall back to defaults */
1353 ret = krb5_cc_resolve(context, CONST_DISCARD(char *, ccache_string), &ccache);
1354 if (ret) {
1355 goto done;
1356 }
1357
1358 if (client_string) {
1359 ret = smb_krb5_parse_name(context, client_string, &client);
1360 if (ret) {
1361 goto done;
1362 }
1363 } else {
1364 ret = krb5_cc_get_principal(context, ccache, &client);
1365 if (ret) {
1366 goto done;
1367 }
1368 }
1369
1370 #ifdef HAVE_KRB5_GET_RENEWED_CREDS /* MIT */
1371 {
1372 ret = krb5_get_renewed_creds(context, &creds, client, ccache, CONST_DISCARD(char *, service_string));
1373 if (ret) {
1374 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1375 goto done;
1376 }
1377 }
1378 #elif defined(HAVE_KRB5_GET_KDC_CRED) /* Heimdal */
1379 {
1380 krb5_kdc_flags flags;
1381 krb5_realm *client_realm = NULL;
1382
1383 ret = krb5_copy_principal(context, client, &creds_in.client);
1384 if (ret) {
1385 goto done;
1386 }
1387
1388 if (service_string) {
1389 ret = smb_krb5_parse_name(context, service_string, &creds_in.server);
1390 if (ret) {
1391 goto done;
1392 }
1393 } else {
1394 /* build tgt service by default */
1395 client_realm = krb5_princ_realm(context, creds_in.client);
1396 if (!client_realm) {
1397 ret = ENOMEM;
1398 goto done;
1399 }
1400 ret = krb5_make_principal(context, &creds_in.server, *client_realm, KRB5_TGS_NAME, *client_realm, NULL);
1401 if (ret) {
1402 goto done;
1403 }
1404 }
1405
1406 flags.i = 0;
1407 flags.b.renewable = flags.b.renew = True;
1408
1409 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &creds_in, &creds_out);
1410 if (ret) {
1411 DEBUG(10,("smb_krb5_renew_ticket: krb5_get_kdc_cred failed: %s\n", error_message(ret)));
1412 goto done;
1413 }
1414
1415 creds = *creds_out;
1416 }
1417 #else
1418 #error NO_SUITABLE_KRB5_TICKET_RENEW_FUNCTION_AVAILABLE
1419 #endif
1420
1421 /* hm, doesn't that create a new one if the old one wasn't there? - Guenther */
1422 ret = krb5_cc_initialize(context, ccache, client);
1423 if (ret) {
1424 goto done;
1425 }
1426
1427 ret = krb5_cc_store_cred(context, ccache, &creds);
1428
1429 if (expire_time) {
1430 *expire_time = (time_t) creds.times.endtime;
1431 }
1432
1433 done:
1434 krb5_free_cred_contents(context, &creds_in);
1435
1436 if (creds_out) {
1437 krb5_free_creds(context, creds_out);
1438 } else {
1439 krb5_free_cred_contents(context, &creds);
1440 }
1441
1442 if (client) {
1443 krb5_free_principal(context, client);
1444 }
1445 if (ccache) {
1446 krb5_cc_close(context, ccache);
1447 }
1448 if (context) {
1449 krb5_free_context(context);
1450 }
1451
1452 return ret;
1453 }
1454
1455 krb5_error_code smb_krb5_free_addresses(krb5_context context, smb_krb5_addresses *addr)
1456 {
1457 krb5_error_code ret = 0;
1458 if (addr == NULL) {
1459 return ret;
1460 }
1461 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1462 krb5_free_addresses(context, addr->addrs);
1463 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1464 ret = krb5_free_addresses(context, addr->addrs);
1465 SAFE_FREE(addr->addrs);
1466 #endif
1467 SAFE_FREE(addr);
1468 addr = NULL;
1469 return ret;
1470 }
1471
1472 krb5_error_code smb_krb5_gen_netbios_krb5_address(smb_krb5_addresses **kerb_addr)
1473 {
1474 krb5_error_code ret = 0;
1475 nstring buf;
1476 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1477 krb5_address **addrs = NULL;
1478 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1479 krb5_addresses *addrs = NULL;
1480 #endif
1481
1482 *kerb_addr = (smb_krb5_addresses *)SMB_MALLOC(sizeof(smb_krb5_addresses));
1483 if (*kerb_addr == NULL) {
1484 return ENOMEM;
1485 }
1486
1487 put_name(buf, global_myname(), ' ', 0x20);
1488
1489 #if defined(HAVE_MAGIC_IN_KRB5_ADDRESS) && defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS) /* MIT */
1490 {
1491 int num_addr = 2;
1492
1493 addrs = (krb5_address **)SMB_MALLOC(sizeof(krb5_address *) * num_addr);
1494 if (addrs == NULL) {
1495 SAFE_FREE(*kerb_addr);
1496 return ENOMEM;
1497 }
1498
1499 memset(addrs, 0, sizeof(krb5_address *) * num_addr);
1500
1501 addrs[0] = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1502 if (addrs[0] == NULL) {
1503 SAFE_FREE(addrs);
1504 SAFE_FREE(*kerb_addr);
1505 return ENOMEM;
1506 }
1507
1508 addrs[0]->magic = KV5M_ADDRESS;
1509 addrs[0]->addrtype = KRB5_ADDR_NETBIOS;
1510 addrs[0]->length = MAX_NETBIOSNAME_LEN;
1511 addrs[0]->contents = (unsigned char *)SMB_MALLOC(addrs[0]->length);
1512 if (addrs[0]->contents == NULL) {
1513 SAFE_FREE(addrs[0]);
1514 SAFE_FREE(addrs);
1515 SAFE_FREE(*kerb_addr);
1516 return ENOMEM;
1517 }
1518
1519 memcpy(addrs[0]->contents, buf, addrs[0]->length);
1520
1521 addrs[1] = NULL;
1522 }
1523 #elif defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS) /* Heimdal */
1524 {
1525 addrs = (krb5_addresses *)SMB_MALLOC(sizeof(krb5_addresses));
1526 if (addrs == NULL) {
1527 SAFE_FREE(*kerb_addr);
1528 return ENOMEM;
1529 }
1530
1531 memset(addrs, 0, sizeof(krb5_addresses));
1532
1533 addrs->len = 1;
1534 addrs->val = (krb5_address *)SMB_MALLOC(sizeof(krb5_address));
1535 if (addrs->val == NULL) {
1536 SAFE_FREE(addrs);
1537 SAFE_FREE(kerb_addr);
1538 return ENOMEM;
1539 }
1540
1541 addrs->val[0].addr_type = KRB5_ADDR_NETBIOS;
1542 addrs->val[0].address.length = MAX_NETBIOSNAME_LEN;
1543 addrs->val[0].address.data = (unsigned char *)SMB_MALLOC(addrs->val[0].address.length);
1544 if (addrs->val[0].address.data == NULL) {
1545 SAFE_FREE(addrs->val);
1546 SAFE_FREE(addrs);
1547 SAFE_FREE(*kerb_addr);
1548 return ENOMEM;
1549 }
1550
1551 memcpy(addrs->val[0].address.data, buf, addrs->val[0].address.length);
1552 }
1553 #else
1554 #error UNKNOWN_KRB5_ADDRESS_FORMAT
1555 #endif
1556 (*kerb_addr)->addrs = addrs;
1557
1558 return ret;
1559 }
1560
1561 void smb_krb5_free_error(krb5_context context, krb5_error *krberror)
1562 {
1563 #ifdef HAVE_KRB5_FREE_ERROR_CONTENTS /* Heimdal */
1564 krb5_free_error_contents(context, krberror);
1565 #else /* MIT */
1566 krb5_free_error(context, krberror);
1567 #endif
1568 }
1569
1570 krb5_error_code handle_krberror_packet(krb5_context context,
1571 krb5_data *packet)
1572 {
1573 krb5_error_code ret;
1574 bool got_error_code = False;
1575
1576 DEBUG(10,("handle_krberror_packet: got error packet\n"));
1577
1578 #ifdef HAVE_E_DATA_POINTER_IN_KRB5_ERROR /* Heimdal */
1579 {
1580 krb5_error krberror;
1581
1582 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1583 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1584 error_message(ret)));
1585 return ret;
1586 }
1587
1588 if (krberror.e_data == NULL || krberror.e_data->data == NULL) {
1589 ret = (krb5_error_code) krberror.error_code;
1590 got_error_code = True;
1591 }
1592
1593 smb_krb5_free_error(context, &krberror);
1594 }
1595 #else /* MIT */
1596 {
1597 krb5_error *krberror;
1598
1599 if ((ret = krb5_rd_error(context, packet, &krberror))) {
1600 DEBUG(10,("handle_krberror_packet: krb5_rd_error failed with: %s\n",
1601 error_message(ret)));
1602 return ret;
1603 }
1604
1605 if (krberror->e_data.data == NULL) {
1606 #if defined(ERROR_TABLE_BASE_krb5)
1607 ret = ERROR_TABLE_BASE_krb5 + (krb5_error_code) krberror->error;
1608 #else
1609 ret = (krb5_error_code)krberror->error;
1610 #endif
1611 got_error_code = True;
1612 }
1613 smb_krb5_free_error(context, krberror);
1614 }
1615 #endif
1616 if (got_error_code) {
1617 DEBUG(5,("handle_krberror_packet: got KERBERR from kpasswd: %s (%d)\n",
1618 error_message(ret), ret));
1619 }
1620 return ret;
1621 }
1622
1623 krb5_error_code smb_krb5_get_init_creds_opt_alloc(krb5_context context,
1624 krb5_get_init_creds_opt **opt)
1625 {
1626 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC
1627 /* Heimdal or modern MIT version */
1628 return krb5_get_init_creds_opt_alloc(context, opt);
1629 #else
1630 /* Historical MIT version */
1631 krb5_get_init_creds_opt *my_opt;
1632
1633 *opt = NULL;
1634
1635 if ((my_opt = SMB_MALLOC_P(krb5_get_init_creds_opt)) == NULL) {
1636 return ENOMEM;
1637 }
1638
1639 krb5_get_init_creds_opt_init(my_opt);
1640
1641 *opt = my_opt;
1642 return 0;
1643 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_ALLOC */
1644 }
1645
1646 void smb_krb5_get_init_creds_opt_free(krb5_context context,
1647 krb5_get_init_creds_opt *opt)
1648 {
1649 #ifdef HAVE_KRB5_GET_INIT_CREDS_OPT_FREE
1650
1651 #ifdef KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT
1652 /* Modern MIT or Heimdal version */
1653 krb5_get_init_creds_opt_free(context, opt);
1654 #else
1655 /* Heimdal version */
1656 krb5_get_init_creds_opt_free(opt);
1657 #endif /* KRB5_CREDS_OPT_FREE_REQUIRES_CONTEXT */
1658
1659 #else /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1660 /* Historical MIT version */
1661 SAFE_FREE(opt);
1662 opt = NULL;
1663 #endif /* HAVE_KRB5_GET_INIT_CREDS_OPT_FREE */
1664 }
1665
1666 krb5_enctype smb_get_enctype_from_kt_entry(krb5_keytab_entry *kt_entry)
1667 {
1668 return KRB5_KEY_TYPE(KRB5_KT_KEY(kt_entry));
1669 }
1670
1671
1672 /* caller needs to free etype_s */
1673 krb5_error_code smb_krb5_enctype_to_string(krb5_context context,
1674 krb5_enctype enctype,
1675 char **etype_s)
1676 {
1677 #ifdef HAVE_KRB5_ENCTYPE_TO_STRING_WITH_KRB5_CONTEXT_ARG
1678 return krb5_enctype_to_string(context, enctype, etype_s); /* Heimdal */
1679 #elif defined(HAVE_KRB5_ENCTYPE_TO_STRING_WITH_SIZE_T_ARG)
1680 char buf[256];
1681 krb5_error_code ret = krb5_enctype_to_string(enctype, buf, 256); /* MIT */
1682 if (ret) {
1683 return ret;
1684 }
1685 *etype_s = SMB_STRDUP(buf);
1686 if (!*etype_s) {
1687 return ENOMEM;
1688 }
1689 return ret;
1690 #else
1691 #error UNKNOWN_KRB5_ENCTYPE_TO_STRING_FUNCTION
1692 #endif
1693 }
1694
1695 krb5_error_code smb_krb5_mk_error(krb5_context context,
1696 krb5_error_code error_code,
1697 const krb5_principal server,
1698 krb5_data *reply)
1699 {
1700 #ifdef HAVE_SHORT_KRB5_MK_ERROR_INTERFACE /* MIT */
1701 /*
1702 * The MIT interface is *terrible*.
1703 * We have to construct this ourselves...
1704 */
1705 krb5_error e;
1706
1707 memset(&e, 0, sizeof(e));
1708 krb5_us_timeofday(context, &e.stime, &e.susec);
1709 e.server = server;
1710 #if defined(krb5_err_base)
1711 e.error = error_code - krb5_err_base;
1712 #elif defined(ERROR_TABLE_BASE_krb5)
1713 e.error = error_code - ERROR_TABLE_BASE_krb5;
1714 #else
1715 e.error = error_code; /* Almost certainly wrong, but what can we do... ? */
1716 #endif
1717
1718 return krb5_mk_error(context, &e, reply);
1719 #else /* Heimdal. */
1720 return krb5_mk_error(context,
1721 error_code,
1722 NULL,
1723 NULL, /* e_data */
1724 NULL,
1725 server,
1726 NULL,
1727 NULL,
1728 reply);
1729 #endif
1730 }
1731
1732 /**********************************************************************
1733 * Open a krb5 keytab with flags, handles readonly or readwrite access and
1734 * allows to process non-default keytab names.
1735 * @param context krb5_context
1736 * @param keytab_name_req string
1737 * @param write_access bool if writable keytab is required
1738 * @param krb5_keytab pointer to krb5_keytab (close with krb5_kt_close())
1739 * @return krb5_error_code
1740 **********************************************************************/
1741
1742 /* This MAX_NAME_LEN is a constant defined in krb5.h */
1743 #ifndef MAX_KEYTAB_NAME_LEN
1744 #define MAX_KEYTAB_NAME_LEN 1100
1745 #endif
1746
1747 krb5_error_code smb_krb5_open_keytab(krb5_context context,
1748 const char *keytab_name_req,
1749 bool write_access,
1750 krb5_keytab *keytab)
1751 {
1752 krb5_error_code ret = 0;
1753 TALLOC_CTX *mem_ctx;
1754 char keytab_string[MAX_KEYTAB_NAME_LEN];
1755 char *kt_str = NULL;
1756 bool found_valid_name = False;
1757 const char *pragma = "FILE";
1758 const char *tmp = NULL;
1759
1760 if (!write_access && !keytab_name_req) {
1761 /* caller just wants to read the default keytab readonly, so be it */
1762 return krb5_kt_default(context, keytab);
1763 }
1764
1765 mem_ctx = talloc_init("smb_krb5_open_keytab");
1766 if (!mem_ctx) {
1767 return ENOMEM;
1768 }
1769
1770 #ifdef HAVE_WRFILE_KEYTAB
1771 if (write_access) {
1772 pragma = "WRFILE";
1773 }
1774 #endif
1775
1776 if (keytab_name_req) {
1777
1778 if (strlen(keytab_name_req) > MAX_KEYTAB_NAME_LEN) {
1779 ret = KRB5_CONFIG_NOTENUFSPACE;
1780 goto out;
1781 }
1782
1783 if ((strncmp(keytab_name_req, "WRFILE:/", 8) == 0) ||
1784 (strncmp(keytab_name_req, "FILE:/", 6) == 0)) {
1785 tmp = keytab_name_req;
1786 goto resolve;
1787 }
1788
1789 if (keytab_name_req[0] != '/') {
1790 ret = KRB5_KT_BADNAME;
1791 goto out;
1792 }
1793
1794 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, keytab_name_req);
1795 if (!tmp) {
1796 ret = ENOMEM;
1797 goto out;
1798 }
1799
1800 goto resolve;
1801 }
1802
1803 /* we need to handle more complex keytab_strings, like:
1804 * "ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab" */
1805
1806 ret = krb5_kt_default_name(context, &keytab_string[0], MAX_KEYTAB_NAME_LEN - 2);
1807 if (ret) {
1808 goto out;
1809 }
1810
1811 DEBUG(10,("smb_krb5_open_keytab: krb5_kt_default_name returned %s\n", keytab_string));
1812
1813 tmp = talloc_strdup(mem_ctx, keytab_string);
1814 if (!tmp) {
1815 ret = ENOMEM;
1816 goto out;
1817 }
1818
1819 if (strncmp(tmp, "ANY:", 4) == 0) {
1820 tmp += 4;
1821 }
1822
1823 memset(&keytab_string, '\0', sizeof(keytab_string));
1824
1825 while (next_token_talloc(mem_ctx, &tmp, &kt_str, ",")) {
1826 if (strncmp(kt_str, "WRFILE:", 7) == 0) {
1827 found_valid_name = True;
1828 tmp = kt_str;
1829 tmp += 7;
1830 }
1831
1832 if (strncmp(kt_str, "FILE:", 5) == 0) {
1833 found_valid_name = True;
1834 tmp = kt_str;
1835 tmp += 5;
1836 }
1837
1838 if (tmp[0] == '/') {
1839 /* Treat as a FILE: keytab definition. */
1840 found_valid_name = true;
1841 }
1842
1843 if (found_valid_name) {
1844 if (tmp[0] != '/') {
1845 ret = KRB5_KT_BADNAME;
1846 goto out;
1847 }
1848
1849 tmp = talloc_asprintf(mem_ctx, "%s:%s", pragma, tmp);
1850 if (!tmp) {
1851 ret = ENOMEM;
1852 goto out;
1853 }
1854 break;
1855 }
1856 }
1857
1858 if (!found_valid_name) {
1859 ret = KRB5_KT_UNKNOWN_TYPE;
1860 goto out;
1861 }
1862
1863 resolve:
1864 DEBUG(10,("smb_krb5_open_keytab: resolving: %s\n", tmp));
1865 ret = krb5_kt_resolve(context, tmp, keytab);
1866
1867 out:
1868 TALLOC_FREE(mem_ctx);
1869 return ret;
1870 }
1871
1872 krb5_error_code smb_krb5_keytab_name(TALLOC_CTX *mem_ctx,
1873 krb5_context context,
1874 krb5_keytab keytab,
1875 const char **keytab_name)
1876 {
1877 char keytab_string[MAX_KEYTAB_NAME_LEN];
1878 krb5_error_code ret = 0;
1879
1880 ret = krb5_kt_get_name(context, keytab,
1881 keytab_string, MAX_KEYTAB_NAME_LEN - 2);
1882 if (ret) {
1883 return ret;
1884 }
1885
1886 *keytab_name = talloc_strdup(mem_ctx, keytab_string);
1887 if (!*keytab_name) {
1888 return ENOMEM;
1889 }
1890
1891 return ret;
1892 }
1893
1894 #if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
1895 defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
1896 defined(HAVE_KRB5_GET_CREDS)
1897 static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
1898 krb5_ccache ccache,
1899 krb5_principal me,
1900 krb5_principal server,
1901 krb5_principal impersonate_princ,
1902 krb5_creds **out_creds)
1903 {
1904 krb5_error_code ret;
1905 krb5_get_creds_opt opt;
1906
1907 ret = krb5_get_creds_opt_alloc(context, &opt);
1908 if (ret) {
1909 goto done;
1910 }
1911 krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
1912
1913 if (impersonate_princ) {
1914 ret = krb5_get_creds_opt_set_impersonate(context, opt,
1915 impersonate_princ);
1916 if (ret) {
1917 goto done;
1918 }
1919 }
1920
1921 ret = krb5_get_creds(context, opt, ccache, server, out_creds);
1922 if (ret) {
1923 goto done;
1924 }
1925
1926 done:
1927 if (opt) {
1928 krb5_get_creds_opt_free(context, opt);
1929 }
1930 return ret;
1931 }
1932 #endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
1933
1934 #ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
1935 static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
1936 krb5_ccache ccache,
1937 krb5_principal me,
1938 krb5_principal server,
1939 krb5_principal impersonate_princ,
1940 krb5_creds **out_creds)
1941 {
1942 krb5_error_code ret;
1943 krb5_creds in_creds;
1944
1945 #if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
1946 krb5_error_code KRB5_CALLCONV
1947 krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
1948 krb5_ccache ccache, krb5_creds *in_creds,
1949 krb5_data *subject_cert,
1950 krb5_creds **out_creds);
1951 #endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
1952
1953 ZERO_STRUCT(in_creds);
1954
1955 if (impersonate_princ) {
1956
1957 in_creds.server = me;
1958 in_creds.client = impersonate_princ;
1959
1960 ret = krb5_get_credentials_for_user(context,
1961 0, /* krb5_flags options */
1962 ccache,
1963 &in_creds,
1964 NULL, /* krb5_data *subject_cert */
1965 out_creds);
1966 } else {
1967 in_creds.client = me;
1968 in_creds.server = server;
1969
1970 ret = krb5_get_credentials(context, 0, ccache,
1971 &in_creds, out_creds);
1972 }
1973
1974 return ret;
1975 }
1976 #endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
1977
1978 /*
1979 * smb_krb5_get_credentials
1980 *
1981 * @brief Get krb5 credentials for a server
1982 *
1983 * @param[in] context An initialized krb5_context
1984 * @param[in] ccache An initialized krb5_ccache
1985 * @param[in] me The krb5_principal of the caller
1986 * @param[in] server The krb5_principal of the requested service
1987 * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
1988 * @param[out] out_creds The returned krb5_creds structure
1989 * @return krb5_error_code
1990 *
1991 */
1992 krb5_error_code smb_krb5_get_credentials(krb5_context context,
1993 krb5_ccache ccache,
1994 krb5_principal me,
1995 krb5_principal server,
1996 krb5_principal impersonate_princ,
1997 krb5_creds **out_creds)
1998 {
1999 krb5_error_code ret;
2000 krb5_creds *creds = NULL;
2001
2002 *out_creds = NULL;
2003
2004 if (impersonate_princ) {
2005 #ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
2006 ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
2007 #elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
2008 ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
2009 #else
2010 ret = ENOTSUP;
2011 #endif
2012 } else {
2013 krb5_creds in_creds;
2014
2015 ZERO_STRUCT(in_creds);
2016
2017 in_creds.client = me;
2018 in_creds.server = server;
2019
2020 ret = krb5_get_credentials(context, 0, ccache,
2021 &in_creds, &creds);
2022 }
2023 if (ret) {
2024 goto done;
2025 }
2026
2027 if (out_creds) {
2028 *out_creds = creds;
2029 }
2030
2031 done:
2032 if (creds && ret) {
2033 krb5_free_creds(context, creds);
2034 }
2035
2036 return ret;
2037 }
2038
2039 /*
2040 * smb_krb5_get_creds
2041 *
2042 * @brief Get krb5 credentials for a server
2043 *
2044 * @param[in] server_s The string name of the service
2045 * @param[in] time_offset The offset to the KDCs time in seconds (optional)
2046 * @param[in] cc The krb5 credential cache string name (optional)
2047 * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
2048 * @param[out] creds_p The returned krb5_creds structure
2049 * @return krb5_error_code
2050 *
2051 */
2052 krb5_error_code smb_krb5_get_creds(const char *server_s,
2053 time_t time_offset,
2054 const char *cc,
2055 const char *impersonate_princ_s,
2056 krb5_creds **creds_p)
2057 {
2058 krb5_error_code ret;
2059 krb5_context context = NULL;
2060 krb5_principal me = NULL;
2061 krb5_principal server = NULL;
2062 krb5_principal impersonate_princ = NULL;
2063 krb5_creds *creds = NULL;
2064 krb5_ccache ccache = NULL;
2065
2066 *creds_p = NULL;
2067
2068 initialize_krb5_error_table();
2069 ret = krb5_init_context(&context);
2070 if (ret) {
2071 goto done;
2072 }
2073
2074 if (time_offset != 0) {
2075 krb5_set_real_time(context, time(NULL) + time_offset, 0);
2076 }
2077
2078 ret = krb5_cc_resolve(context, cc ? cc :
2079 krb5_cc_default_name(context), &ccache);
2080 if (ret) {
2081 goto done;
2082 }
2083
2084 ret = krb5_cc_get_principal(context, ccache, &me);
2085 if (ret) {
2086 goto done;
2087 }
2088
2089 ret = smb_krb5_parse_name(context, server_s, &server);
2090 if (ret) {
2091 goto done;
2092 }
2093
2094 if (impersonate_princ_s) {
2095 ret = smb_krb5_parse_name(context, impersonate_princ_s,
2096 &impersonate_princ);
2097 if (ret) {
2098 goto done;
2099 }
2100 }
2101
2102 ret = smb_krb5_get_credentials(context, ccache,
2103 me, server, impersonate_princ,
2104 &creds);
2105 if (ret) {
2106 goto done;
2107 }
2108
2109 ret = krb5_cc_store_cred(context, ccache, creds);
2110 if (ret) {
2111 goto done;
2112 }
2113
2114 if (creds_p) {
2115 *creds_p = creds;
2116 }
2117
2118 DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
2119 server_s));
2120
2121 if (impersonate_princ_s) {
2122 char *client = NULL;
2123
2124 ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
2125 if (ret) {
2126 goto done;
2127 }
2128 DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
2129 client));
2130 TALLOC_FREE(client);
2131 }
2132
2133 done:
2134 if (!context) {
2135 return ret;
2136 }
2137
2138 if (creds && ret) {
2139 krb5_free_creds(context, creds);
2140 }
2141 if (server) {
2142 krb5_free_principal(context, server);
2143 }
2144 if (me) {
2145 krb5_free_principal(context, me);
2146 }
2147 if (impersonate_princ) {
2148 krb5_free_principal(context, impersonate_princ);
2149 }
2150 if (ccache) {
2151 krb5_cc_close(context, ccache);
2152 }
2153 krb5_free_context(context);
2154
2155 return ret;
2156 }
2157
2158 /*
2159 * smb_krb5_principal_get_realm
2160 *
2161 * @brief Get realm of a principal
2162 *
2163 * @param[in] context The krb5_context
2164 * @param[in] principal The principal
2165 * @return pointer to the realm
2166 *
2167 */
2168
2169 char *smb_krb5_principal_get_realm(krb5_context context,
2170 krb5_principal principal)
2171 {
2172 #ifdef HAVE_KRB5_PRINCIPAL_GET_REALM /* Heimdal */
2173 return krb5_principal_get_realm(context, principal);
2174 #elif defined(krb5_princ_realm) /* MIT */
2175 krb5_data *realm;
2176 realm = krb5_princ_realm(context, principal);
2177 return (char *)realm->data;
2178 #else
2179 return NULL;
2180 #endif
2181 }
2182
2183 #else /* HAVE_KRB5 */
2184 /* this saves a few linking headaches */
2185 int cli_krb5_get_ticket(TALLOC_CTX *mem_ctx,
2186 const char *principal, time_t time_offset,
2187 DATA_BLOB *ticket, DATA_BLOB *session_key_krb5,
2188 uint32_t extra_ap_opts,
2189 const char *ccname, time_t *tgs_expire,
2190 const char *impersonate_princ_s)
2191 {
2192 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2193 return 1;
2194 }
2195
2196 bool unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
2197 {
2198 DEBUG(0,("NO KERBEROS SUPPORT\n"));
2199 return false;
2200 }
2201
2202 #endif /* HAVE_KRB5 */
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